Continue moving emmet extension to strict mode. This change does the following:
- Remove jsdoc types. These are unused in ts files and can easily get out of date
- Annotate when something can return undefined
- Add null checks for when something can be undefined
- Add explicit types when something can be any
* Start moving emmet to strict mode
First part of moving the emmet extension to strict mode TypeScript. This change focuses on adding annotations when things can be undefined and removing jsdoc type comments
* Fix a few more errors
* Fix compile errors
* Tiny updates
